Fix compilation with icx 2025

Author: johguenther

openvkl/include/openvkl/VKLBackgroundUndefined.h

@@ -3,11 +3,28 @@
 
 #pragma once
 
-#include "ispc_cpp_interop.h"
-
 // A special value we use to distinguish an undefined field value. This could
 // be the result of sampling out of bounds, or sampling at a position in bounds
 // but not covered by any input data.
 // This value is a quiet NaN.
-#define VKL_BACKGROUND_UNDEFINED floatbits(0xFFC068B5u)
 
+#ifdef ISPC
+#define vkl_floatbits floatbits
+#else
+#if defined(__cplusplus)
+#include <cstdint>
+#include <cstring>
+using std::memcpy;
+#else
+#include <stdint.h>
+#include <string.h>
+#endif
+inline float vkl_floatbits(uint32_t bits)
+{
+  float fval;
+  memcpy(&fval, &bits, 4);
+  return fval;
+}
+#endif
+
+#define VKL_BACKGROUND_UNDEFINED vkl_floatbits(0xFFC068B5u)

openvkl/include/openvkl/ispc_cpp_interop.h

@@ -79,42 +79,6 @@
 
 #endif  // defined(__cplusplus)
 
-// -----------------------------------------------------------------------------
-// Standard library functions.
-// -----------------------------------------------------------------------------
-
-#if defined(__cplusplus)
-
-inline float floatbits(vkl_uint32 bits)
-{
-  VKL_INTEROP_STATIC_ASSERT(sizeof(float) == sizeof(vkl_uint32),
-                            "Float is not 4 Bytes.");
-  float fval                         = 0.f;
-  reinterpret_cast<char *>(&fval)[0] = reinterpret_cast<const char *>(&bits)[0];
-  reinterpret_cast<char *>(&fval)[1] = reinterpret_cast<const char *>(&bits)[1];
-  reinterpret_cast<char *>(&fval)[2] = reinterpret_cast<const char *>(&bits)[2];
-  reinterpret_cast<char *>(&fval)[3] = reinterpret_cast<const char *>(&bits)[3];
-  return fval;
-}
-
-inline vkl_uint32 intbits(float value)
-{
-  VKL_INTEROP_STATIC_ASSERT(sizeof(float) == sizeof(vkl_uint32),
-                            "Float is not 4 Bytes.");
-  vkl_uint32 ival = 0;
-  reinterpret_cast<char *>(&ival)[0] =
-      reinterpret_cast<const char *>(&value)[0];
-  reinterpret_cast<char *>(&ival)[1] =
-      reinterpret_cast<const char *>(&value)[1];
-  reinterpret_cast<char *>(&ival)[2] =
-      reinterpret_cast<const char *>(&value)[2];
-  reinterpret_cast<char *>(&ival)[3] =
-      reinterpret_cast<const char *>(&value)[3];
-  return ival;
-}
-
-#endif
-
 // -----------------------------------------------------------------------------
 // Helpers for univary definitions.
 // -----------------------------------------------------------------------------